Cleaning concrete elements - Van der Valk Hotel Nootdorp
The concrete elements around the hotel were covered with algae and cosmos. After cleaning, the concrete elements were provided with the transparent water-based Stone Coat. This gave the surface a repellent property and reduced algae growth.

Goal
The concrete elements around a hotel had suffered from algae and lichen growth over the years, which made the aesthetic appearance and maintenance difficult. After thorough cleaning, the elements were treated with Stone Coat, a transparent, water-based coating. This treatment gives the surface a dirt and water-repellent property, which significantly reduces algae growth. The result is a clean and durable finish, which simplifies maintenance and extends the life of the concrete elements.
Stone Coat
Chemona Stone Coat offers long-lasting protection against weathering and pollution and is suitable for both indoor and outdoor applications. This PFAS-free Nano Coating is highly concentrated, biodegradable and effectively protects porous stones and concrete.
- PFAS free and biodegradable
- Impregnating floors, tiles and facades.
- Suitable for both indoor and outdoor use
- Colorless, retains the natural appearance of the stone
- Water-repellent (hydrophobic) and dirt-repellent (oleophobic)
- Resistant to chlorine and salt water, ideal for swimming pool environments
